A spindle-shaped passive micro-mixer

Abstract

The invention discloses a spindle-shaped passive micro-mixer, which comprises a cover plate, a base body and a bottom plate arranged sequentially from top to bottom, the cover plate is provided with a first inlet passage, a second inlet passage and a spindle-shaped mixing unit, the first Both the inlet of the first channel and the inlet of the second channel are connected to the first channel, a spindle-shaped mixing unit is also provided on the bottom plate, a third channel is provided on the base, and one end of the third channel is connected to the spindle-shaped mixing unit on the cover plate, The other end is connected to the spindle-shaped mixing unit on the bottom plate; when flowing in the first channel, relying on molecular diffusion, after mixing, it is divided into multiple channels under the shunting action of the side channel and the middle channel, and mixed separately; it is converging at the confluence part , flows to the spindle-shaped mixing unit on the bottom plate through the third channel, and mixes again, thus improving the mixing effect.

Description

technical field [0001] The invention belongs to the field of micro-mixers, in particular to a spindle-shaped passive micro-mixer. Background technique [0002] As an important part of the microfluidic chip, the micromixer plays a vital role in the microfluidic analysis process. At the microscopic scale, due to the sharp increase of the surface area and volume ratio of the microchannel, the flow velocity of the fluid in the microchannel is generally small, which belongs to the laminar flow at a low Reynolds number. Therefore, the mixing of microfluids can only be realized under the action of intermolecular diffusion at the microscopic scale, and the design of micromixers is very important at this time. [0003] Micromixers can be divided into active micromixers and passive micromixers according to whether the mixing needs to be completed by external power. The active micro-mixer is mainly to disturb the fluid flow field in the micro-channel by setting the energy field drive...

AI Technical Summary

Problems solved by technology

[0004] The inventors have found that the passive micro-mixer with a general two-dimensional structure extends the length of the entire mixer or increases the number of blocking blocks in the channel. This type of passive micro-mixer is simple to process, but the mixing efficiency is low and the mixing channel is long; Passive micro-mixers with complex structures such as passive micro-mixers and chaotic convective passive micro-mixers have severe disturbances to the fluid and good mixing effects, but they have disadvantages such as complicated manufacturing processes and large pressure drop in microchannels.

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